See: http://www.jqwidgets.com/jquery-widgets-documentation/documentation/angular2/angular2-webpack.htm?search=
Also for your angular-cli config:
add the needed js files in your script section in angular-cli.json: For example: ( i added jqwidgets-framework to my package.json and installed it so the files are in my node-modules folder)
"scripts": [
"../node_modules/jqwidgets-framework/jqwidgets/jqxcore.js",
"../node_modules/jqwidgets-framework/jqwidgets/jqxdata.js",
"../node_modules/jqwidgets-framework/jqwidgets/jqxdraw.js",
"../node_modules/jqwidgets-framework/jqwidgets/jqxchart.core.js"
],